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/*
* Mach Operating System
* Copyright (c) 1991,1990,1989 Carnegie Mellon University
* All Rights Reserved.
*
* Permission to use, copy, modify and distribute this software and its
* documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie Mellon
* the rights to redistribute these changes.
*/
/*
* Author: David B. Golub, Carnegie Mellon University
* Date: 11/89
*
* Bind an IO operation to the master CPU.
*/
#ifndef _DEVICE_DEV_MASTER_H_
#define _DEVICE_DEV_MASTER_H_
#include <cpus.h>
#if NCPUS > 1
#include <kern/macros.h>
#include <kern/cpu_number.h>
#include <kern/sched_prim.h>
#include <kern/thread.h>
#include <kern/processor.h>
#define io_grab_master() \
MACRO_BEGIN \
thread_bind(current_thread(), master_processor); \
if (current_processor() != master_processor) \
thread_block((void (*)()) 0); \
MACRO_END
#define io_release_master() \
MACRO_BEGIN \
thread_bind(current_thread(), PROCESSOR_NULL); \
MACRO_END
#else NCPUS > 1
#define io_grab_master()
#define io_release_master()
#endif NCPUS > 1
#endif /* _DEVICE_DEV_MASTER_H_ */
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